Charles w



(No Model.)

U. WPFOWLBR. NOISE DEADENING COVER FOR OPENINGS IN PAVEMENTS.

No. 469,501. Patented Peb.'23, 1892;.

Inventor,

Charles fifl awler;

nzfnesses;

UNITED STATES PATENT OFFICE.

CHARLES W. FOIVLER, OF BALTIMORE, MARYLAND.

NOlSE-DEADENING COVER FOR OPENINGS IN PAVEMENTS.

SPECIFICATION forming part of Letters Patent No. %69,501, dated February23, 1892.

Application filed December 2, 1891. Serial No. 413,761- (No model.)

To all whom it may concern:

Be it known that I, CHARLES W. FOWLER, a resident of Baltimore, in theState of Maryland, have invented a new and useful Improvement inNoise-Deadening Covers for Openings in Pavements, which improvement isfully set forth in'the following specification.

This invention has reference to the construction of removable covers orplates for openings of any sort in the surface of streetpavements, andis particularly designed for covering the man-hole openings to theconduits of cable roads. It is also useful for gutter-coverings andsimilar purposes.

The object of the invention is to avoid the noise andother-objectionable features attendant upon the use of iron plates,which are generally employed for the above purposes; and to this end thecover consists of the combination of an iron frame or support and acement or other like plastic filling. Structures of these two materialshave been heretofore designed, and therefore are not broadly claimed, myinvention consisting in the particular construction of the iron frameand its cement filling whereby a strong, durable structure is producednot likely to be injured by frost or by concussion from the wheels ofheavy vehicles.

The invention may be most conveniently explained in connection with theaccompanying drawings, in which-- Figure I is a plan view showing halfof the iron frame of the covering-plate constructed according to theinvention, and Fig. II is a vertical section showing part of the cementfilling in place.

The iron support consists of an outer surrounding frame A, having aflange a to rest on the edge of the opening to be covered andintersecting webs b. The openings between the webs extend entirelythrough the plate, so that the cement filling appears on both sides, andthese webs are thickest at the point 0, from which they taper in bothdirections. By the projections on both sides of the web the cementfilling is held firmly in place.

The webs Z) terminate some little distance be low the upper edge of theframe A, whereby a continuous hollow or depression of suitable depth isformed entirely across the plate between the side frames, so that thecement when placed in position covers practically the entire uppersurface of the plate, resting on a reticulated bed, the apertures ofwhich are also filled with cement.

In Fig. II a portion of the cement filling is represented at B. It isapplied by laying the frame on a flat surface, filling in the cement ina plastic state, and subjecting to compression until it is set. Themetal and plastic material are thus combined in a very substantialmanner, and the structure is not readily affected by Wear or by theaction of frost. A minimum of metal surface is exposed to contact withthe wheelsof vehicles, and noise is consequently to a great extentprevented.

As shown in the drawings, the cover has a central portion D, of ovalform, which is removable forpurpose of inspection. This portion of thecover is constructed like the main body thereof. It has a flanged edge,which rests on a shoulder a of the main frame, from which it can bereadily raised when desired.

Having now fully described my said invention, what I claim is Anoise-deadening plate for street-openings, comprising a metal supporthaving an outer frame and a reticulated central portion composed ofintersecting webs tapering in section both upwardly and downwardly andterminating at the top beneath the upper edge of the metal frame,combined with a filling of plastic substance forming a continuoussurface over the tops of the webs and filling the spaces between them,substantially as described.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

CHARLES W. FOWLER. l/Vitnesses:

PHILIP HIss, WM. H. J ones.

